Fix minor typos

Signed-off-by: Jan Bruckner <jan@janbruckner.de>
diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index bcf9072..3d820a5 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -4736,7 +4736,7 @@
  *
  * \note           When this function returns #MBEDTLS_ERR_SSL_WANT_WRITE/READ,
  *                 it must be called later with the *same* arguments,
- *                 until it returns a value greater that or equal to 0. When
+ *                 until it returns a value greater than or equal to 0. When
  *                 the function returns #MBEDTLS_ERR_SSL_WANT_WRITE there may be
  *                 some partial data in the output buffer, however this is not
  *                 yet sent.